The father as well as his three children _______ skating on the frozen river every Sunday afternoon in winter.

(2013·山东济宁一模)How close parents are to their children ________ a strong influence on the development of the children's characters.

It is said that 30% of the apples here _______ from abroad while 80% of the rice _____ grown here．   

It’s 8 o’clock. My mother is reading a book. My sister and I _____.

 The number of smokers in China ________increased in recent years, and a number of them _________ the youth.